Process for the biological purification of water

Details Process for the biological purification of water Process for the biological purification of water

1993-09-17

1996-05-28

Wyse, Thomas G.

Liquid purification or separation

Processes

Treatment by living organism

210616, 210621, 210903, C02F 310, C02F 328

Patent

active

055208126

ABSTRACT:
In the process, water, in which organic carbon, ammonium and nitrate are contained, is biologically purified. In a first reaction vessel (10) forming a denitrifying biofilm reactor the carbon is to a large extent eliminated under partly anoxic, partly aerobic conditions by the use of nitrate-containing oxygen, and molecular oxygen respectively. In a second, ventilated reaction vessel (20) the ammonium is converted at least partially by nitric bacteria into nitrates. Water containing nitrates is recirculated from the second into the first reaction vessel. In the first reaction vessel the water to be treated is conveyed from the top to the bottom via a flooded fixed bed. To supplement a deficiency in nitrate-containing oxygen in the elimination of carbon the fixed bed is ventilated in the base region with a gas which contains a metered amount of molecular oxygen. The process according to the invention is particularly suitable for the purification of waste water having a variable ammonium concentration.

REFERENCES:
patent: 4756831 (1988-07-01), Menzel et al.
patent: 5019266 (1991-05-01), Soeder et al.
patent: 5228997 (1993-07-01), Martin et al.
patent: 5322621 (1994-06-01), Fan et al.
patent: 5348653 (1994-09-01), Rovel
patent: 5403487 (1995-04-01), Lodaya et al.

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